Power jack for pumps and the like



1950 R. T. CRUIKSHANK 2,534,428

POWER JACK FOR PUMPS AND THE LIKE Filed Dec. 25, 1946 v swam om ROSS T. CRUIKSHANK Patented Dec. 19, 1950 rowan JACK FOR PUMPS AND THE LIKE Ross '1. Cruikshank, Minneapolis, Minn., assignor of one-half to Carl A. Anderson, Minneapolis,

Minn.

Application December 23, 1946, Serial No. 717,840

3 Claims.

This invention relates to improvements in power jacks for longitudinally reciprocating pump plungers or the like by the application of either rotary or oscillatory power.

My present invention is an improvement over the structure disclosed in my application Serial No. 651,359 filed March 1, 1946, entitled Pump Jack and which issued as Patent No. 2,445,133 on July 13, 1948.

The structure of my earlier application, while adapted for wide general use, was particularly conceived for use on farms and in the pumping of water and other liquids where the required stroke was comparatively short.

It is an object of my present invention to provide a power jack adapted for very heavy work, such as, for example, the pumping of oil in oil fields, whereby substantial elimination of sharp pulsations and jerkiness is achieved and whereby the cooperating parts of the working mechanism are so related as to give great efficiency, maximum wear, and to adapt a pump to heavy work and eflicient operation where strokes in excess of seventy inches are required.

Another object is the provision of improvements over my earliest structure whereby power converting or motion changing gears are related with a driving mechanism, frame, and reciproeating carriage to align the parts for maximum efficiency, provision of adequate bearing surface symmetrically disposed with reference to the line of thrust and pull, and to impart power in both liftin and thrust strokes advantageously.

A still further object is the provision of a ccm mercially practical, heavy-duty pump jack which, through interchangeability of some of the parts and cooperation of working mechanism, can be manufactured at relatively low cost.

These and other objects and advantages of the invention will more fully appear from the follow ing description made in connection with the accompanying drawings, wherein like reference characters refer to the same or similar parts throughout the views and in which:

Figure 1 is a longitudinal vertical sectional view taken substantially on the line l-I of Fig. 3;

Figure 2 is a side elevation of the pump jack;

Figure 3 is an end elevation of the pump jack;

Figure 4 is a partial vertical transverse sectional view through the power converting mechanism;

Figure 5 is a horizontal sectional view taken =substantially on the line 5-5 of Figure 4;

Figure 6 is a side elevation view of an alternative form of the gear wheel mounting member with the front face of the casing cut away; and

Figure 7 is a vertical sectional view of said alternative form taken substantially on the line 66 of Figure 6.

In the form shown, the mechanism of my invention is mounted upon a suitable base [0 anchored to the ground and has a vertically mov-- able element such as a pump or piston rod H centrally disposed therein and extending therethrough, said piston rod being mounted for reciprocation in a pump cylinder or well pipe (not shown). A supporting frame is provided which comprises four spaced guiding members such as the rods l2, which are rigidly mounted in opposed relation on said base It.

Four interchangeable identically similar castings are provided and are mounted on said guide rods 12. Two of said castings are slidably mounted on the lower portion of said guide rods [2 to form reciprocable carriage members I3. The upper extremity of piston rod H has an enlarged pin-connecting member 14 fixed thereto. A pin l5 traverses the space between the lower portions of reciprocable carriage members l3 and connects said pin-connecting member I4 therewith being journaled in said carriage members l3. The space between the upper portion of said carriage members 13 being traversed by a stub shaft is which is journaled in bearings therein.

The other two interchangeable castings are inverted and firmly connected to the upper portion of said guide rods 2 to form stationary mountings ll, said mountings I! being aligned with carriage members 13 and mounted on the same guide rods respectively as carriage members 13 in upwardly relation thereto.

Either rotary or oscillatory power may be used to drive the disclosed mechanism; in the form shown rotary power is provided as by sheaves I8 connected with an external source of power and fixed on one end of a pinion shaft I9, said shaft l9 being jcurnaled for rotation in bearings in the .upper portion of said stationary mountings I1 and extending therethrough. A pinion gear 29 is fixed on the other end of said shaft l9 and is meshed with a driving bull gear 2|. A drive shaft 22 is axially fixed in bull gear 2| and is journaled in bearings in the lower portion of said stationary mountings I1 extending therethrough and being journaled therein.

A power-converting mechanism is provided, which comprises a pair of power-converting gear the pinion shaft wheels 23 and 24 connected by and journaled in a gear wheel mounting member 25. The gear wheel 23 is eccentrically aifixed on said drive shaft 22 perpendicularly thereto and medially disposed between the stationary mountings i'i. Gear Wheel 2&- is eccentrically mounted on shaft [5 perpendicular thereto and medially disposed between the carriage members it. Said gear wheel 2% is of the same diameter as gear wheel 23 and is meshed therewith the radii of eccentricity of the two gear wheels are equal. In the form shown in Figs. 1 to 5 inclusive, the central peripheral portion a guide way out therein adapted to receive the gear wheel 1n0unt-- bearings to fit abou --ce the peripheries of the central guir. iys in the wheels and heels for axial ro' wtion 7 of mount 24, journaling said therein. ing member soperiphery of the protective purposes.

Operation When rotary power is applied to sheaves ii is rota ed, rotatin pinion J The bull gear b .h pinion gear as.

gear 2i] is thus rotated drive shaft The drive shaft rotates in the bear ngs "a the stationary mountings and Q i wheel 23, eccentrically aifixed ther: The gear wheel axially rotates in the upper portion or" mounting 25, axially rotating the gear wheel in the lower portion of iting the gear as on shaft is. motion of drive shaft which is transmitted to 1' through shaft rotated in a clockwise reciprocable carriage Fig. 1 shows the carria f the stroke, artly lowered t e c in partially raised position.

It will be seen that .c oscillation of the bull gear ill will produce the reaction on c reciprocable carriage l "1.7 By this improved co sti disclosed herein the wear on the bearings jot; ling the shaits 22 and i5 is considerably reduce by providing two Jiors one and by ing member, designated as 25, is provided, as shown in Figs. 6 and '7. This alternative form is of split two-piece construction and when assembled, completely encloses the peripheral portions of the gear wheels. Ihe opposed sections have large, aligned gear wheel bearing apertures. It is necessary to provide a pair of gear wheels 2'! and 2B which have the teeth or" said gear wheels medially disposed about the periphery of said wheels. ihe marginal portions of the periphery of said wheels on either side of the teeth thereof, form guideways adapted to be sealingly embraced by th aligned bearing apertures of said casing 26 thereby enclosing the teeth of the gear within a chamber in vvhich a lubricating fluid can be retained. This provides an additional safety feature of completely covering the teeth of the gear to prevent articles and objects from getting enmeshed therewith.

The operation of the alterna stantially the same as that of t ly described, shaft being is within wheel and shaft is eccentrically in wheel 23.

secnthatah has been provided to convert rotary motion into iprooat' motion. Said mechanism is particularly adapted to carry la e gear wheels which will permit long stroke, desirable for pump ing liq such as oil and the like, i? r. deep wells. l disclosed the conveflng gears 1 as the connecting and etc aligned with the rnov- This feature gives driven. symmet; and evenly di the force the do, thrust and upward puli on the be ings provided to take e same. In addition "0 e a ge-s, impi "ement of the advantages in my prior invention, 5;

also eniicdies 'ai Nuinincorporate ber 651,359.

The laws of certain loca ties require that the teeth of the operating gears of machines such as pumps, to be used in homes and on re s, be protected from obj cts becoming enmeshed therein. ns of my gear whe inount quire protection or most oi the In addition to this, the alternative form provi'es a casing adapted to retain a lubricating fluid in which the gear wheels can rotate. 1

It will of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts ithout departing from the scope of my invention.

What is claimed is:

l. A reciprocable pump jack comprising a sup porting structure, a c e shaft adaptel to rotary power applie leto and journaied on said struct e for rotation on a horiz i tion to said struc tary toothed wh el eccentricalr for eecent-no rotation abot 2. A pump jack comprising a supporting structure, a drive shaft adapted to have rotary power applied thereto and journaled on said structure for rotation on a horizontal axis disposed in fixed relation to said structure, a rotary toothed gear wheel eccentrically fixed to said shaft for eccentric rotation about said fixed axis, a second toothed gear wheel of similar diameter to said first wheel and meshed therewith to be rotated thereby, a stub shaft eccentrically mounted in said second gear wheel to be reciprocated when said rotary wheels are rotated and adapted to apply reciprocating motion to a member to be reciprocated, said two gear wheels each having a pair of spaced rows of peripherally formed teeth with a central bearing race formed therebetween, a rigid gear wheel mounting member peripherally surrounding said races to journal said wheels and positively hold the same in predetermined meshed relation.

3. A pump jack. comprising a supporting structure, a drive shaft adapted to have rotary power applied thereto and journaled on said structure for rotation on a horizontal axis disposed in fixed relation to said structure, a rotary toothed gear wheel eccentrically fixed to said shaft foreccentric rotation about said fixed axis, a second toothed gear wheel of similar diameter to saidv first wheel and meshed therewith to be rotated thereby, a stub shaft eccentrically mounted in said second gear wheel to be reciprocated when said rotary wheels are rotated and adapted to apply reciprocating motion to a member to be reciprocated, said two gear wheels each having REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,223,283 Kurtz Apr. 17, 1917 1,318,130 Barton Oct. 17, 1919 1,540,699 McMullen June 2, 1925 

